Hey its me...the guy with the brand new 2013 LLT motor. Car started horribly. Like one cylinder would start and the rest would join in over about 5 seconds. Then the car ran fine. Well when we got back to the car to come home (5 hours after getting to our destination) it did it again. So I don't know what's going on

Hmm. Sounds like the fuel pump might be draining back when you leave it sit for a bit, like a bad check valve. Only way to be sure is to put a fuel pressure gauge on it and see if it holds pressure when you shut it down.

I know. I'm at a loss...I honestly just want to push it off a cliff. I wish corporate GM would do something if I contacted them. My was my first brand new car I bought on my own, drove it out of the showroom and have had nothing but problems. I would like to think they would want to make it right.

Hmm. Sounds like the fuel pump might be draining back when you leave it sit for a bit, like a bad check valve. Only way to be sure is to put a fuel pressure gauge on it and see if it holds pressure when you shut it down.

Hmm..never done that before. What I don't get is that yesterday (first day with new motor) everything was fine. Had multiple starts and one start was late at night after it sat awhile.

Hmm. Sounds like the fuel pump might be draining back when you leave it sit for a bit, like a bad check valve. Only way to be sure is to put a fuel pressure gauge on it and see if it holds pressure when you shut it down.

I tried something. I put key yo run position this morning for 5 seconds,turned to off and then started. So it primed the fuel pump. It started better sounding like only one cylinder was off but quickly recovered. So I think you may be on to something. Is this in anyway related to any of the work they did putting in a new engine?

I tried something. I put key yo run position this morning for 5 seconds,turned to off and then started. So it primed the fuel pump. It started better sounding like only one cylinder was off but quickly recovered. So I think you may be on to something. Is this in anyway related to any of the work they did putting in a new engine?

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I would think not. Check valve is located in the fuel pump in the tank.

You have two fuel pumps. One is a low-pressure "lift" pump that's in the tank. The other is the high-pressure pump for the direct injection that's located at the back of the passanger-side cam (behind some baffling). If simply turning on the key for a few seconds before you start it solves the problem, then it is not the high-pressure pump -- it is mechanical. I would have them make sure they got the check valvle replaced (I believe there is one) before removing the tank to replace the lift pump.

Sorry to hear about the concerns. I would like to research these matters further. Though you said you're tired of going to the dealer, what dealership are you referring to and who is the service advisor you worked with? Could you also send me the VIN and mileage of the vehicle? Thanks. I look forward to hearing from you.